/* Copyright (C) 2003-2016 Patrick G. Durand
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.plealog.prefs4j.implem.core.event;

import com.plealog.prefs4j.api.PreferenceModel;

import javax.swing.event.EventListenerList;

public abstract class ConfigurationModelListenerSupport implements PreferenceModel {
	private EventListenerList _listenerList;

	/**
	 * Default constructor.
	 */
	public ConfigurationModelListenerSupport() {
		_listenerList = new EventListenerList();
	}

	/**
	 * Adds a ConfigurationModelListener on this viewer.
	 */
	public void addPreferenceModelListener(PreferenceModelListener l) {
		_listenerList.add(PreferenceModelListener.class, l);
	}

	/**
	 * Removes a ConfigurationModelListener from this viewer.
	 */
	public void removePreferenceModelListener(PreferenceModelListener l) {
		_listenerList.remove(PreferenceModelListener.class, l);
	}

	/**
	 * Fire a selection event.
	 */
	public void fireConfigurationModelEvent(ConfigurationFeatureEvent event) {
		Object[] listeners = _listenerList.getListenerList();
		for (int i = listeners.length - 2; i >= 0; i -= 2) {
			if (listeners[i] == PreferenceModelListener.class) {
				((PreferenceModelListener) listeners[i + 1]).modelChanged(event);
			}
		}
	}

}
